In an atom how many orbital(s) will have the quantum numbers; $$n = 3$$, $$l = 2$$ and $$m_l = +2$$?
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In an atom how many orbital(s) will have the quantum numbers; $$n = 3$$, $$l = 2$$ and $$m_l = +2$$?
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Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :
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Which one of the following molecules is polar?
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In which of the following ionization processes the bond energy has increased and also the magnetic behaviour has changed from paramagnetic to diamagnetic?
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By how many folds the temperature of a gas would increase when the root mean square velocity of the gas molecules in a container of fixed volume is increased from $$5 \times 10^4$$ cm/s to $$10 \times 10^4$$ cm/s?
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Given: (I) $$H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l)$$; $$\Delta H°_{298K} = -285.9$$ kJ mol$$^{-1}$$
(II) $$H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(g)$$; $$\Delta H°_{298K} = -241.8$$ kJ mol$$^{-1}$$
The molar enthalpy of vapourisation of water will be :
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In reaction $$A + 2B \rightleftharpoons 2C + D$$, initial concentration of B was 1.5 times of [A], but at equilibrium the concentrations of A and B became equal. The equilibrium constant for the reaction is :
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Solid $$Ba(NO_3)_2$$ is gradually dissolved in a $$1.0 \times 10^{-4}$$ M $$Na_2CO_3$$ solution. At which concentration of $$Ba^{2+}$$, precipitate of $$BaCO_3$$ begins to form? ($$K_{sp}$$ for $$BaCO_3 = 5.1 \times 10^{-9}$$)
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Given : $$XNa_2HAsO_3 + YNaBrO_3 + ZHCl \rightarrow NaBr + H_3AsO_4 + NaCl$$
The values of X, Y and Z in the above redox reaction are respectively :
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Sodium Carbonate cannot be used in place of $$(NH_4)_2CO_3$$ for the identification of $$Ca^{2+}$$, $$Ba^{2+}$$ and $$Sr^{2+}$$ ions (in group V) during mixture analysis because :
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Which one of the following is most stable?
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Rate of dehydration of alcohols follows the order:
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Which of the following compounds is not expected to show Lassaignes' test for nitrogen?
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The addition of HI in the presence of peroxide catalyst does not follow anti-Markovnikov's rule because :
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An element having an atomic radius of 0.14 nm crystallizes in an $$f_{cc}$$ unit cell. What is the length of a side of the cell?
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12 g of a nonvolatile solute dissolved in 108 g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is :
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Electrode potentials (E°) are given below :
$$Cu^+/Cu = +0.52$$ V,
$$Fe^{3+}/Fe^{2+} = +0.77$$ V,
$$\frac{1}{2}I_2(s)/I^- = +0.54$$ V,
$$Ag^+/Ag = +0.88$$ V.
Based on the above potentials, strongest oxidizing agent will be :
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The instantaneous rate of disappearance of $$MnO_4^-$$ ion in the following reaction is $$4.56 \times 10^{-3}$$ Ms$$^{-1}$$
$$2MnO_4^- + 10I^- + 16H^+ \rightarrow 2Mn^{2+} + 5I_2 + 8H_2O$$
The rate of appearance of $$I_2$$ is :
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The migration of dispersion medium under the influence of an electric potential is called :
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Calcination is the process in which:
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Trigonal bipyramidal geometry is shown by:
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Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of :
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The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds :
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Type of isomerism which exists between $$[Pd(C_6H_5)_2(SCN)_2]$$ and $$[Pd(C_6H_5)_2(NCS)_2]$$ is :
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X is:
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Aryl fluoride may be prepared from arene diazonium chloride using :
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An ether (A), $$C_5H_{12}O$$, when heated with excess of hot concentrated HI produced two alkyl halides which when treated with NaOH yielded compounds (B) and (C). Oxidation of (B) and (C) gave a propanone and an ethanoic acid respectively. The IUPAC name of the ether (A) is :
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Formaldehyde can be distinguished from acetaldehyde by the use of :
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If a polythene sample contains two monodisperse fractions in the ratio 2 : 3 with degree of polymerization 100 and 200, respectively, then its weight average molecular weight will be :
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Which of the following enzyme converts starch into maltose?
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